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4486 Mithra (1987 SB)
Classification: Apollo [NEO, PHA]          SPK-ID: 2004486
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 221 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .6630233904697426 2.098e-08  
a 2.199297518615534 4.2466e-09 au
q .741111821171371 4.6684e-08 au
i 3.039697154069427 2.0505e-06 deg
node 82.2362570110744 5.996e-05 deg
peri 168.9065238525694 5.9042e-05 deg
M 33.94875018002664 7.1049e-06 deg
tp 2458888.157083869024
(2020-Feb-08.65708387)
2.3188e-05 TDB
period 1191.308946358375
3.26
3.4504e-06
9.447e-09
d
yr
n .3021886145491122 8.7524e-10 deg/d
Q 3.657483216059698 7.0622e-09 au
  Orbit Determination Parameters
   # obs. used (total)      902  
   # delay obs. used      8  
   # Doppler obs. used      9  
   data-arc span      12348 days (33.81 yr)  
   first obs. used      1987-01-29  
   last obs. used      2020-11-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53104  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-22 05:20:05  

Additional Information
 Earth MOID = .0462892 au 
 Jupiter MOID = 1.40489 au 
 T_jup = 3.338 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.5   n/a MPO502196  
diameter diameter 1.849 km 0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
extent extent 2.35 x 1.65 x 1.44 km n/a Brozovic et al., 2010, Icarus, 208:207-220  
rotation period rot_per 67.5 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Brozovic, M.; Benner, L.A.M.; Magri, C.; Ostro, S.J.; et al. (2010) Icarus 208, 207-220.]
geometric albedo albedo 0.297   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  

4486 Mithra (1987 SB)          Discovered 1987-Sep-22 by Elst and Shkodrov at Rozhen
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1987 SB = 1974 DN1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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